Methods: The investigators plan a randomized controlled trial comparing the effects of IV versus SC filgrastim (Neupogen®) given as per clinical indication on neutrophil counts in hospitalized patients. The investigators will include patients hospitalized in haemato-oncology ward starting filgrastim for the treatment of chemotherapy-induced neutropenia. The investigators will compare SC vs. IV filgrastim, both given as a single daily dose of 5 mcg/kg (rounded to 300 mcg or 480 mcg). No blinding will be used. Patients will be approached to obtain informed consent and randomized to the mode of filgrastim administration after the decision to administer the drug has been made. Patients will be crossed over to the alternative study arm on the subsequent chemotherapy course, if filgrastim is clinically indicated.